Author(s):

Mukh Ram, Nitesh Kumar, SP Singh, PK Singh and Prabir Kumar Bhattacharyya

Abstract: In the present experiment, the 9 genotypes of rice (3 highly tolerant, 3 moderately tolerant and 3 susceptible for drought tolerance) were crossed in 9x9 diallel cross to produce 36 F₁’s (excluding reciprocals) under drought stress conditions during Kharif-2014 to study the nature and magnitude of heterosis and inbreeding depression. The optimum standard heterosis to the extent of 20-40% was noted in many crosses for all the 19 traits studied except days to 50% flowering and days to maturity, while relatively more heterosis was noted for days to maturity, leaf angle, grain yield per plant, harvest index, test weight, stomatal conductance and proline content under water stress environment, respectively. Inbreeding depression varied with the crosses and traits and found to be relatively more under drought stress conditions. The crosses Nagina-22 × SARJOO-52, Nagina-22 × Vandana, BPT-5204 × MTU-7029, RASI × Nagina-22, BPT-5204 × SARJOO-52, Vandana × RAU-4, RASI × Vandana, APO × SARJOO-52, Rajendra Bhagwati × BPT-5204 and MTU-7029 × SARJOO-52 with optimum standard heterosis over the seasons along with lower inbreeding depression for yield and its component traits were noted as promising crosses under drought stress condition. The crosses involving parents APO, Nagina-22, RAU-4, Sarjoo-52 and Vandana may be considered in the future breeding program, aiming to improve yield under drought stress conditions.

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